Process of making bodies



Feb. 25, 1930. LuCAMPBELL, JR

PROCESS OF MAKING BODIES 2 Sheets-Shee 1 Filed April 4, 1928.

A or 64mph J71 Feb. 25, 1930, 1.. CAMPBELL, JR

PROCESS OF MAKING BODIES Fil April 1928 2 Sheets-Sheet 2 j i J A7 vg 4Lm m v w E A/ A T11 W Z a a I 57d 1/ z 0 Uwv/ Y Patented Feb. 25, 1930UNITED STATES PATENT OFFICE 1.01m CAMPBELL, an, on LAKEWOOD, 01110, assrenon TO THE mums CALOBIFIC comm, or CLEVELAND, OHIO, A conroaa'rron or01110 PROCESS OF MAKING BODIES Application filed April 4,

This invention relates to a process of making bodies having a pluralityof bores or passages therethrough, and particularly to bodies havingbores or passages of such 15, length, shape, or cross-sectional areas asrender the. production of such bodies diflicult and/ or expensive ofaccomplishment. Familiar instances of such bodies are unitary blowpipetips which are employed for the cutting of metal with oxygen. In makingsuch tips, it has been found extremely diflicult to pro-' vide the samewith bores or passages for the mixture of oxygen with preheating gas andto make these bores or passages of the desired cross-sectional area andto preserve the proper relation between them and the central bore forcutting oxygen. While my process is capable of use in the production ofother types of perforated bodies, it will be described herein moreparticularly in connection with the production of blowpipe tips of thecharacter referred to.

In the drawings forming a part hereof, I have shown an original block orblank of metal and the successive forms imparted thereto leading up tothe production of a blowpipe tip such as described hereinbefore; alsovarious forms of tips which may be produced in accordance with myprocess.

In the said drawings 2-- Fig. 1 represents a side elevation of apiece orblank of ductile metal prior to the first operation thereon;

Fig. 2, a central, longitudinal, sectional.

view of the said blank after the same is provided with a central borefor cutting oxygen, and preheating mixture bores surrounding the centralbore; 1

Fi 3, a view similar to Fig. 2, and showing t e mandrels or wiresinserted into the bores; v

F' 4, a view similar to Figs. 2 and 3, showmg the final external shapegiven to the body, and also showing the mandrels or wires still inplace;

Fi 5, a view similar to Fig. 4, and showin t e finished tip; and

igs. 6, 7, 8, 9 and 10, are views similar to Fig. 5, showin modifiedforms of tips 50 which may be pr need by my process.

1928. Serial No. 267,233.

at A in Figs. 1, 2 and 3. This blank is pro- I vided in any convenientmanner with a central longitudinal bore B for the cutting oxygen, andwith a plurality of bores C grouped about the central bore andconverging toward such central bore from the top to the bottom of theblank. The bores or passages B and C will be of greater cross-sectionalareas than the bore or passages desired in the final product. The sizeof the final bores or passages may be determined by inserting into thebores, mandrels D of the desired shape and length, after which the blankis subjected to one or more operations whereby it is elongated and itscross-sectional area varied in accordance with the shape which it isdesired the final product shall assume.

In forming articles such as blowpipe tips, the lower portion of the bodywill usually be contracted or reduced in cross-sectional area to agreater extent than the upper portion, in order to impart the desiredtapered shape thereto. This elongation and reduction in cross-sectionalarea may be effected by any standard mechanical means, such as swaging,rolling, forging or drawing, the result being to produce abodyapproximating more or less the final desired form or shape. Thiselongation and reduction in cross-sectional area of the body isaccompanied by a corresponding reduction in the cross-sectional areas ofthe bores or passages; but the desired shape of such boresor passages ispreservedbythe mandrels inserted therein, which mandrels are of suchlength as to project beyond one or both ends of the body as shown inFig. 4, enabling them to be withdrawn at the end of the shapingoperation However,

be necessary to impart to the body some detailsof form in order to adaptit to its seat in the blowpipe head. In the form shown in Fig. 5, theblock is provided with an annular recess E which is adapted to receivethe preheating gases from the blowpi e head and to distribute them tothe bores 6; also with a central projection F adapted to seat in theblowpipe head and to place the bore B in register with the bore orpassage for cutting oxygen in said head.

n Figs. 6 to 10, inclusive, there are shown modified forms of blowpipetips which may be produced in accordance with my process. Each of thesetips comprises a body A, which is given an exterior shape according tothe use and type of head to which it is to be 3P. plied. It will benoted that each of these tips 'is provided with a central bore B andwith the bores C for preheating gases. In the case of each of the tipsshown in Figs. 6, 7 and 8, one of the preheating gases is Introducedinto the upper ends of the bores C, and the other is introduced throughports G into the said bores at points spaced from the upper ends of thebores. In the form shown in Flg. 6, the preheating gas is supplied tothe ports G from an annular channel H; in the form shown in Fig. 7, thecombustible gas is supplied to the ports G from an annular channel H inthe top of the tip body; and in the form shown in Fig. 8, the gas issupplied to the ports G through an annular channel H arranged somewhatsimilarly to the channel H in Fi 6. In the form shown in Fi 6, the topof t e tip is tapered and the pre eating gas which enters the top of thebore C is supplled thereto from an annular channel J, below a taperedhead K which is adapted to fit a corresponding seat in the blowpipehead. In the form shown in Fig. 7 the cutting oxygen is delivered to theport B from a cham-- ber L in the top of the tip. In the form shown inFig. 8, the upper portion of-the tip is threaded, as shown at M, and thecentral part of the tip is rounded, as shown at N, this end constructionbeing given to the tip to enable it to be secured in operative relationto a particular type of head.

In Fig. 9, the upper end of the tip is of continuous frusto-conicalshape, the upper ends of the bores C extending through the conicalsurface d the upper end of the bore mes es 13 extending through theupper base. In each of the forms shown in Figs. 3-9, inclue sive, the tiis provided with a shoulder O which is a apted to be engaged by ashouldered nut or similar device for securing the ti in place.

the form shown in Fig. 10, the upper central part of the tip is shown asextending a considerable distance above the body A and as being providedwith a thread M for securing the tip in place, while the bores C extendat their upper ends through a shoulder P at the base of such centralextension.

Having thus described the invention, what is claimed is 1. The processof making a unitary body having a plurality of bores extendinglongitudinally therethrough, which consists in providing a blank ofductile metal with bores extending therethrough, swaging said bodythereby to elongate the same and ,to reduce the cross-sectional area ofthe blank and also to reduce the cross sectional areas of the boresbelow the area required in the finished body,

and drilling the said bores to the desired shape and cross sectionalarea.

2. The process of making a umtary body having a plurality of bores of adesired nal y therethrough, which consists in first providing a blank ofductile metal wlth bores extending longitudinally therethrough, the

' said blank and the said bores being shorter and of greatercross-sectional areas than desired for the completed body and bores, in-I serting into said bores forms capable of glving to said bores a shapeand dimensions approximating those desired in the final body, thenelongatin the said blank and the bores thereof and re ucing thecross-sectional areas signature.

LORN CAMPBELL, J R.

length, size and form extending longitu diof said blank and said boressimultaneously,

